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082bb7cf57
Add utilities to create struct nodes in TBAA type DAG and to create path-aware tags. The format of struct nodes in TBAA type DAG: a unique name, a list of fields with field offsets and field types. The format of path-aware tags: a base type in TBAA type DAG, an access type and an offset relative to the base type. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178564 91177308-0d34-0410-b5e6-96231b3b80d8